In general, a node is a localized swelling (a "

knot A knot is an intentional complication in Rope, cordage which may be practical or decorative, or both. Practical knots are classified by function, including List of hitch knots, hitches, List of bend knots, bends, List of loop knots, loop knots, ...

") or a point of intersection (a

vertex Vertex, vertices or vertexes may refer to: Science and technology Mathematics and computer science *Vertex (geometry), a point where two or more curves, lines, or edges meet *Vertex (computer graphics), a data structure that describes the position ...

). Node may refer to:

In mathematics

Vertex (graph theory) In discrete mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges (unordered pairs of ver ...

, a vertex in a mathematical graph *

Vertex (geometry) In geometry, a vertex (in plural form: vertices or vertexes) is a point where two or more curves, lines, or edges meet. As a consequence of this definition, the point where two lines meet to form an angle and the corners of polygons and poly ...

, a point where two or more curves, lines, or edges meet. * Node (autonomous system), behaviour for an ordinary differential equation near a critical point *

Singular point of an algebraic variety In the mathematical field of algebraic geometry, a singular point of an algebraic variety is a point that is 'special' (so, singular), in the geometric sense that at this point the tangent space at the variety may not be regularly defined. In c ...

, a type of singular point of a curve

In science and engineering

Astronomy

Orbital node An orbital node is either of the two points where an orbit intersects a plane of reference to which it is inclined. A non-inclined orbit, which is contained in the reference plane, has no nodes. Planes of reference Common planes of referen ...

, the points where an orbit crosses a plane of reference **

Lunar node A lunar node is either of the two orbital nodes of the Moon, that is, the two points at which the orbit of the Moon intersects the ecliptic. The ''ascending'' (or ''north'') node is where the Moon moves into the northern ecliptic hemisphere ...

, where the orbits of the sun and moon intersect **

Longitude of the ascending node The longitude of the ascending node (☊ or Ω) is one of the orbital elements used to specify the orbit of an object in space. It is the angle from a specified reference direction, called the '' origin of longitude'', to the direction of the as ...

, how orbital nodes are parameterized

Biology

Lymph node A lymph node, or lymph gland, is a kidney-shaped organ of the lymphatic system and the adaptive immune system. A large number of lymph nodes are linked throughout the body by the lymphatic vessels. They are major sites of lymphocytes that inc ...

, an immune system organ used to store white blood cells *

Node of Ranvier In neuroscience and anatomy, nodes of Ranvier ( ), also known as myelin-sheath gaps, occur along a myelinated axon where the axolemma is exposed to the extracellular space. Nodes of Ranvier are uninsulated and highly enriched in ion channels, a ...

, periodic gaps in the insulating myelin sheaths of myelinated axons *

Sinoatrial node The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells. The sinus node is approxi ...

and

atrioventricular node The atrioventricular node or AV node electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart; it is part of the electrical conduction system of the heart. The AV node lies at the lower back section of t ...

, specialized tissues in the heart responsible for initiating and coordinating the heartbeat * Primitive knot or primitive node, the organizer tissue for gastrulation in vertebrates *The place on a

plant stem A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, stores nutrie ...

where a leaf is attached *In

Cladistics Cladistics (; ) is an approach to biological classification in which organisms are categorized in groups (" clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is typically shared derived ch ...

, a shared ancestor (also see Clade)

Computing and electronics

Node (networking) In telecommunications networks, a node (, ‘knot’) is either a redistribution point or a communication endpoint. The definition of a node depends on the network and protocol layer referred to. A physical network node is an electronic devic ...

, a point of connection in a communication network *An entity in a

mesh network A mesh network is a local area network topology in which the infrastructure nodes (i.e. bridges, switches, and other infrastructure devices) connect directly, dynamically and non-hierarchically to as many other nodes as possible and cooperate wit ...

* Node (circuits), a region in an electrical circuit where there is no change in potential *

Node (computer science) A node is a basic unit of a data structure, such as a linked list or tree data structure. Nodes contain data and also may link to other nodes. Links between nodes are often implemented by pointers. Nodes and Trees Nodes are often arranged int ...

, a basic unit used to build data structures * Goal node (computer science), a node in a graph that meets defined criteria for success or termination *

Node (UML) A node in the Unified Modeling Language (UML) is a computational resource upon which UML artifacts may be deployed for execution. OMG (2008). OMG Unified Modeling Language (OMG UML), Superstructure, V2.1.2'' p.199-210. There are two types of n ...

, the representation of a computational device in the Unified Modeling Language * Node.js, a JavaScript-based, cross-platform runtime environment * NodeB, hardware that is connected to the mobile phone network * NODE (wireless sensor), a wireless handheld sensor for smart devices *Node, a shorthand used to designate a

semiconductor fabrication process Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuit (IC) chips such as modern computer processors, microcontrollers, and memory chips such as NAND flash and DRAM that are pre ...

Linguistics

* Node (linguistics), a branch point in the

Tree model In historical linguistics, the tree model (also Stammbaum, genetic, or cladistic model) is a model of the evolution of languages analogous to the concept of a family tree, particularly a phylogenetic tree in the biological evolution of specie ...

, or Node Theory, of language evolution

Physics

Node (physics) A node is a point along a standing wave where the wave has minimum amplitude. For instance, in a vibrating guitar string, the ends of the string are nodes. By changing the position of the end node through frets, the guitarist changes the effec ...

, a point along a standing wave where the wave has minimal amplitude

Space-station modules

Unity (ISS module) upright=1.0, The ''Unity'' module as seen in May 2011 The ''Unity'' connecting module, also known as Node 1, is the first U.S.-built component of the International Space Station (ISS). It connects the Russian and United States segments of t ...

or Node 1, one of the first modules of the International Space Station *

Harmony (ISS module) ''Harmony'', also known as ''Node 2'', is the "utility hub" of the International Space Station. It connects the laboratory modules of the United States, Europe and Japan, as well as providing electrical power and electronic data. Sleeping cab ...

or Node 2, module of the International Space Station *

Tranquility (ISS module) ''Tranquility'', also known as Node 3, is a module of the International Space Station (ISS). It contains environmental control systems, life support systems, a toilet, exercise equipment, and an observation cupola. The European Space Agency ...

or Node 3, a module of the International Space Station with the Cupola * Node 4, a proposed module of the International Space Station * ''

Prichal (ISS module) ''Prichal'' nodal module also known as Uzlovoy Module or UM (russian: Узловой Модуль "Причал", ''Nodal Module Berth'') is a Russian spacecraft which is part of the International Space Station (ISS). It was approved in 2011 ...

'', a planned module of the International Space Station to be launched in 2021

In music

Node (band) Node is an Italian death metal band formed in Milan in 1994 and currently signed to Punishment 18 Records. Their last (sixth) full-length studio album, ''Cowards Empire'' was released in 2016. Members *CN Sid (since 2012) *Gary D'Eramo – guitar ...

, Italian death metal band * Node (singer), Danish singer and hip hop artist of Kurdish origin * ''Node'' (album), a 2015 album by Australian metalcore band Northlane

Other uses

* Node, Kentucky * Node tribe, a community of pastoral nomads in India and Pakistan *

Node In general, a node is a localized swelling (a "knot") or a point of intersection (a vertex). Node may refer to: In mathematics * Vertex (graph theory), a vertex in a mathematical graph * Vertex (geometry), a point where two or more curves, line ...

, a transport hub in a transportation system *

Giordana Racing Team The Velosure Giordana Pro Cycling Team () are a British UCI Continental cycling team. Profile The Velosure Giordana cycling team are sponsored by Node4, a Data Centre Services provider. The team rides senior professional events in the United ...

, a British cycling team, formerly named Node4-Giordana *''

Node Magazine ''Node Magazine'' is a literature, literary project in the guise of a fictional magazine created to annotate the novel ''Spook Country'' by William Gibson. The project is essentially a hypertext version of the novel. It takes its name from ''Node ...

'', a literary project based on the novel ''

Spook Country ''Spook Country'' is a 2007 novel by speculative fiction author William Gibson. A political thriller set in contemporary North America, it followed on from the author's previous novel, '' Pattern Recognition'' (2003), and was succeeded in 2010 by ...

'' by

William Gibson William Ford Gibson (born March 17, 1948) is an American-Canadian speculative fiction writer and essayist widely credited with pioneering the science fiction subgenre known as ''cyberpunk''. Beginning his writing career in the late 1970s, hi ...

*''New Oxford Dictionary of English'', a single-volume English language dictionary, see

Oxford Dictionary of English The ''Oxford Dictionary of English'' (''ODE'') is a single-volume English dictionary published by Oxford University Press, first published in 1998 as ''The New Oxford Dictionary of English'' (''NODE''). The word "new" was dropped from the tit ...

*Node, a cyborg with a donated human face used as a guide, in " Silence in the Library" (''Doctor Who'') *Node, the pommel-like part of a

chalice A chalice (from Latin 'mug', borrowed from Ancient Greek () 'cup') or goblet is a footed cup intended to hold a drink. In religious practice, a chalice is often used for drinking during a ceremony or may carry a certain symbolic meaning. R ...

where the stem meets the cup *A nodal organizational structure, such as in terms of business management, see Cellular organizational structure